Draft appliance for locomotives



E. L. SCHELLENS DRAFT APPLIANCE FOR LOCOMOTIVES May 29, 1928.

- Filed April 28, 1925 2 Sheets-Sheat- "1 INVENTOR' n BY 2 ATTORNEYS E.L. SCHELLENS DRAFT APPLIANCE FOR LOCOMOTIVES May 29, 1928.

Filed April 28, 1925 2 Sheets-Shea; 2

R m m w A TTORNEY5 Patented May 29, 1928.

UNITED STATES EUGENE L. SCHELLENS, OF POINTE CLAIRE, QUEBEC, CANADA,ASSIGNOR, BY MESNE PATENT, OFFICE. I

ASSIGNMENTS, 'IO C-S ENGINEERING COMPANY, A CORPORATION OF DELAWARE.

DRAFT Ar'rLIAnoE'EoE LOCOMOTIVES.

Application filed April 28, 1925.

the copending application of Joel S. Coffin,

Jr., and myself, Serial No. 681,450, filed December 18, 1923. This draftdevice is used in place of the usualnozzle arrangement,

the draft being created by a fan, diagrammatically indicated at 7 whichfan is'preferably operated by exhaust steam. The fan produces a more orless continuous draft which may be of relatively low velocity butrelatively large volume and I have discovered that the fan, by reason ofits momentum, continues to revolve for a considerable period after thethrottle is closed and the locomotive engines are no longer receivingsteam. In consequence of this there is quite.

a pull on the fire for some moments after throttle closure and thisproduces heavy pop losses.

It is, therefore, one of the primary objects I of my invention toovercome the difliculty above set forth in a locomotive drafted by sucha draft appliance.

How the foregoing, together with such other objects and advantages, asmay hereinafter appear, or are incident to my invention, is obtained, isillustrated in the accompanying drawings, wherein I Fig. 1 is adiagrammaticside elevation of a locomotive in which my improvements areembodied, certain of the parts being broken out;

Fig. 2 is an enlarged fragmentary side elevation of certain details ofmy invention;

Fig. 3 is a section taken on the line 33 of Fig. 2;

Fig. 4 is an elevation illustrating still other details of theinvention; and

Fig. 5 illustrates a modification of the invention.

Referring now to Fig. 1, the reference numeral 8 indicates thelocomotive boiler, the reference numeral 9 the fire-box and thereference numeral 10 the frontend or smokebox. The cylinders and valvechests are respectively indicated at 11 and 12, exhaust Serial No.26,358.

steam being supplied to the draft device thru the pipes 13 and passages14. The 1000-. motive throttle is shown at 15 and the drypipe at 16. Thefire-box has the usual ashpan 17, but theopening between the firebox andthe ash-pan is closedby dampers 18.

When the throttle 15 is open and the locomotive is working steannthedampers 18 are held in open position by means of a pressure operateddevice 19 which may be of any desired construction and to which pressureis supplied from the dry-pipe by means of the connection 20, Thepressure admitted to the device 19 rocks the shaft 19, the opposite endsof which-are connected to the dampers on opposite sides of the fire-boxthru the medium of the links 21. l/Vhenthe throttle 15 is closed andpressure is, therefore, no longer supplied to the device 19, the damperis closed by gravity, thus check ing the draft. In consequence of this,even I tho the fan may continue to rotate for some time after thethrottle is closed, the fire'is checked and pop losses are avoided.

If desired, the blower line. may also be connected to the device 19 (seeFig. 5) by the pipe 22 so as to open the dampers when blowing up thefire when standing. In that event two check valves 23 and 24 areprovided so as to ensure proper flow of steam to the device 19. 4 Iclaim: a

1. In a locomotive, the combination of a grate, a fire box whichreceives its air through said grate, a draft creating fan operated byexhaust steam, fire box damper means for controlling such airautomatically operating to check the fire when the throttle isclosed tocompensate for the rotation of said fan after said throttle is closed.

2. In a locomotive, the combination of a check valve in eachof saidconnections.

In testimony whereof, I have hereunto signed my name.

EUGENE L. soHELLENs

